Buyer persona: how to build one that does not end up in a drawer
Most buyer personas are useless fiction. How to build one from real interviews and your own business data, and which questions to ask.
AI, digital marketing and medical marketing consultant · btodigital
A buyer persona is a portrait of your ideal customer built from real data, not from assumptions made by a team in a room. That distinction is everything: most of the ones I have seen in Colombian companies are fiction with a name and a stock photo, which is why they end up in a folder nobody opens.
The test is simple. If your buyer persona has not changed a single decision in the last three months, it is not a buyer persona: it is an exercise.
What is it actually for?
For three concrete decisions. If it is not resolving those, it is surplus:
- What to write. Which questions to answer, and in what order.
- Which objection to attack first on the page, in the ad and in the sales conversation.
- Who NOT to chase. The most valuable one, and the one almost never used.
Where does the data come from?
In this order of value, which is nearly the reverse of what most people use:
| Source | What it gives you | Effort |
|---|---|---|
| Interviews with real customers | The exact words, the true objection, the trigger moment | High, and worth every minute |
| People who said no | Why they did not choose you, which nobody asks | Medium |
| Your sales team | The questions that repeat | Low |
| Search and analytics | How they name their problem | Low |
| WhatsApp conversations | Real, unfiltered language | Low |
| Market studies | General context | Low and barely actionable |
Five well-run interviews give you more than any report. By the sixth or seventh the answers start repeating, and that is where you can stop.
What do you ask in those interviews?
Do not ask what they value. Ask what happened. These seven work:
- What was going on the day you decided to look for a solution? Look for the trigger, not the abstract need.
- What did you literally search for? Ask for the exact words.
- Who else did you talk to? This is where your real competition appears, and it is rarely who you think.
- What nearly stopped you hiring us? The true objection comes out here.
- Who else had to approve it?
- What did you expect to happen, and what happened?
- Who would you recommend this to, and why?
The fourth is the most uncomfortable and the most profitable. It almost always reveals something fixable in an afternoon.
What should the profile contain?
Less demographics and more behaviour. What I use:
- The trigger. What has to happen for them to start looking.
- How they name their problem. In their words, not yours.
- What they fear. Usually looking bad in front of someone, not losing money.
- Who else decides.
- Which alternative they consider, including “do nothing”, which is often the main competitor.
- Where they search. Google, WhatsApp, a colleague, a group.
- What makes them decide. The specific detail that tipped it.
Age, gender and income bracket almost never change a marketing decision. The real objection does.
What about the customer journey?
The buyer persona says who. The journey says when. They work together.
| Stage | What is in their head | What they need from you |
|---|---|---|
| Unaware of the problem | Puts up with the friction | Content that names it |
| Knows the problem, not the solution | Searching for what this is called | Guides and explanations |
| Comparing solutions | Torn between approaches | Honest comparisons |
| Comparing suppliers | Torn between you and two others | Cases, prices, method |
| Deciding | Looking for a reason not to get it wrong | Ease and reassurance |
The most common error is having all your content in the first two stages and nothing in the fourth, which is where the business is lost.
What mistakes do I see most?
- Inventing it in a boardroom. If nobody spoke to a customer, it is a collective opinion.
- Making six different personas. Beyond two or three, nobody uses them. Start with one.
- Filling it with demographics and leaving out the objection and the trigger.
- Never updating it. A three-year-old persona describes a market that no longer exists.
- Not using it. The most frequent failure. If it is not on the table when an ad gets written, it achieved nothing.
Does AI help with this?
It helps process, not invent.
It works very well for transcribing interviews, finding patterns across dozens of WhatsApp conversations and clustering the words people use to describe the problem. That saves days.
What you must not do is ask a model to “generate a buyer persona” from nothing. It will hand you something plausible, well written and completely invented, which is exactly the problem you were trying to avoid. You supply the data.
Frequently asked questions
What is a buyer persona? A portrait of your ideal customer built from real data: interviews, sales records, analytics and conversations. It is used to decide what content to create, which objection to attack and who not to chase.
How many buyer personas should I have? One or two to start. Three is the sensible maximum for a small or medium company. Beyond that the team stops using them.
How many interviews do I need? Five usually reveal the pattern, and by the seventh answers repeat. Better five deep conversations than a survey of a hundred people.
Does this work for small businesses? Even more so, because a small business cannot afford to speak to everyone. And it is easier: you probably know your customers by name already.
How often should it be updated? Once a year, or whenever you change product, price or market.
Can I ask ChatGPT or Claude to build it for me? For processing interviews and finding patterns, yes, and it saves a lot of time. For inventing it from scratch, no: you will get something convincing and false.
What is the difference between a buyer persona and a target audience? The target audience is a segment (“SMBs in Medellín with 10 to 50 employees”). The buyer persona is a specific person inside that segment, with their trigger, their fear and their objection. The first helps you target campaigns; the second helps you write.